I don't want to hog the conversation here and others may know specifically how the bolts are meant to go but from general principles I'd space the bolts out as close to the four corners as was practical. These things shake and rattle as you ride along and having all the bolts close together means a little bit of give in the plastic or wear or just normal material elasticity will result in the box maybe coming slightly loose.
Re the clamps, I'd probably have used large load spreading washers there but if you've got the bits Givi supplied then use them. As a general rule (one I've made up!) the nuts go on the inside of the box as it makes it harder for spannerboy to undo them at 3.00am (or 2.00pm when you're having lunch). Try to arrange things so that you don't have long lengths of exposed bolt sticking up in the box - they'll wear through anything you pack down on top of them.
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